Geomorphological evidence inconvenient for the antecedent rivers of the Arun and Tista across the Himalayan range  

作　　者：NAKATA Takashi KUMAHARA Yasuhiro NAIK Sambit Prasanajit SAKAI Harutaka 

机构地区：[1]Graduate School of Humanities and Social Sciences,Hiroshima University,Higashi-Hiroshima 739-8522,Japan [2]Active Fault and Earthquake Hazard Mitigation Research Center,Pukyong National University,Busan 48513,South Korea [3]Department of Petroleum Engineering and Earth Sciences,University of Petroleum and Energy Studies,Dehradun 248007,India [4]Graduate School of Science,Kyoto University,Kyoto 606-8502,Japan

出　　处：《Journal of Mountain Science》2024年第9期3001-3017,共17页山地科学学报（英文）

基　　金：This work was supported by Grants-in-Aid for Scientific Research of the Japanese Society for the Promotion of Science(JSPS KAKENHI)Grant Number 18H00766(principal investigator:Takashi Nakata);Grant Number 18KK0027(principal investigator:Yasuhiro Kumahara).

摘　　要：The Arun and Tista Rivers,which flow across the Himalayas,are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan ranges.To clarify whether the idea of antecedent rivers is acceptable,we investigated the geomorphology of the Himalayas between eastern Nepal and Bhutan Himalayas.The southern part of Tibetan Plateau,extending across the Himalayas as tectonically un-deformed glaciated terrain named as'Tibetan Corridor,'does not suggest the regional uplift of the Higher Himalayas.The 8,000-m class mountains of Everest,Makalu,and Kanchenjunga are isolated residual peaks on the glaciated terrain composed of mountain peaks of 4,000–6,000 m high.The Tibetan glaciers commonly beheaded by Himalayan glaciers along the great watershed of the Himalayas suggest the expansion of Himalayan river drainage by glaciation.For the narrow upstream regions of the Arun and Tista Rivers with less precipitation behind the range,it is hard to collect enough water for the power of down-cutting their channels against the uplifting Himalayas.The fission track ages of the Higher Himalayan Crystalline Nappe suggest that the Himalayas attained their present altitude by 11–10 Ma,and the Arun and Tista Rivers formed deep gorges across the Himalayas by headward erosion.

关 键 词：HIMALAYA Antecedent river GEOMORPHOLOGY AW3D30 DSM Glacier piracy 

分 类 号：P931[天文地球—自然地理学]